含DOPO磷酸酯阻燃改性环氧丙烯酸树脂的制备及热性能研究

将工业上广泛应用的光固化树脂EA作为基体,通过分子设计,利用甲苯二异氰酸酯TDI的双异氰酸酯结构将合成的磷酸酯阻燃剂ODOPM链接到其分子主链上,制备出一组改性的光固化丙烯酸酯预聚物。利用FT-IR,1 H-NMR,31P-NMR对分子结构进行表征;极限氧指数（LOI）和微型量热仪（MCC）的结果表明材料的阻燃性能明显提高,改性后树脂的热释放速率峰值PHRR相对于EA降低了近66%,总热释放量也明显降低;扫描电镜结果显示改性后的树脂固化膜形成的炭层变得更平滑和致密,并且完整无破裂现象;同时对固化膜的热稳定性和热降解过程进行了探讨。分析论证了ODOPM改性修饰后的EA有更高的阻燃性,成炭能力明显增强,形成的致密炭层有效地阻止了热交换,使材料在高温下更稳定。

Preparation, flame retardancy and thermal properties of a novel phosphate modified UV-curable epoxy acrylate coating

A series of UV-curable flame retardant resins were obtained using epoxy acrylate(EA) modified with 2-(6-oxido-6H-dibenz<1,2>oxaphos-phorin-6-yl) methanol(ODOPM).The molecular structure was characterized by FTIR,1H-NMR,31P-NMR.The flammability of resins was characterized by the limiting oxygen index(LOI),and microscale combustion colorimeter(MCC).The thermal degradation of the flame retardant resins was studied using thermogravimetric analysis(TGA).The results indicated that the heat release rate(HRR) decreases greatly with the content of ODOPM.The TGA data showed that the modified EA resins have lower initial decomposition temperatures and higher char residues than pure EA.The morphology and structure of char residue for systems with or without ODOPM were also explored by Scanning electron microscopy(SEM),respectively.The results showed ODOPM modified EA had a higher flame resistance,and significantly enhanced the char formation.